<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <mate http-eauiv="X-UA-Compatible"content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
     <script src="vue.js"></script>
</head>
    <body>
        <div id="app">
        {{msg}}
    </div>
<script>
        var vm = new Vue({
        el: '#app', 
        data: { 
            msg:"ok"
        },
        beforeCreateO(){
            console.log('实例创建之前')
            onsole.log(this.Sdata.msg) 
        },
        created(){
            console.log('实例创建之后')
            console.log(this.$data.msg)
        }
    })
    </script>
</body>
</html>